Hello, I get this AE error message that says Ram Preview needs 2 or more frames for playback. I don't know what I do to cause this nor can I figure out what I have done in the past to get the 2 or more frames. The message seems to just sometimes pop up out of nowhere when I press the ram preview or the Enter or Return keys. A related preview issue is that sometimes if I stop a RAM preview before its completes the work area, it will only play for the duration of the GREEN bar that was created, and the only way I can get past this is to press the Space bar, then the Green Bar keeps is current lenght and moves along with the current time indictor, and won't grow any larger. I tried going to Preferences and cleaning the Media database and cache, but that doesn't seem to do anything to help.

If you are working in HD, and your actual comp panel is in full rez, sometimes, you just don't have enough ram left to create a ram preview. In that case you'll see this error. Try to lower the resolution of the comp viewer, and try again.

I am working in HD, but at first the Ram preview goes all the way from beginning to the end, some of my clips have been 1 min long. It just all of the sudden stops doing the ram previews. When it really gets annoying I purge and Quit AE and when I start up again the RAM Preview is good again

You are working with compressed media, right? In that case, probably something with the media cache is going on. Once it gets "tainted" or full, it can cause weird side effects. Try purging it as well and have AE rebuild it. Also note, that some video capture cards may cause these errors, so if you are using one of those, updating the driver may be required.